ARLA/CLUSTER: O IMPRESSIONANTE modo JT9 consegue descodificar sinais a -40dB.

[Renato Encarnação]

Boas João

Esse novo modo descodifica sinais de -40dB em relação a que?

-40dBm certamente não será, pois isso é um sinalão.

Não estarão a referir-se à relação sinal-ruido??

Adiante lá.

73, Renato

2012/11/21 João Costa > CT1FBF <ct1fbf  gmail.com>

> New Mode for MF and LF
>
> If you are on 160 meters, or perhaps on 472 or 137 kHz, you may be
> interested in a new mode called JT9, designed especially for making
> QSOs on these bands. JT9 uses the structured messages introduced in
> 2003 for the JT65 mode, now widely used for EME and for QRP operations
> at HF.
>
> JT9 can operate at signal levels as low as -27 dB (in a 2500 Hz
> reference bandwidth), with one-minute timed transmissions. It also
> offers slower transmissions of 2, 5, 10 and 30 minutes duration, and
> the slowest mode can decode signals as weak as -40 dB. With one-minute
> transmissions, submode JT9-1 has a total bandwidth of 15.6 Hz -- less
> than one-tenth the bandwidth of a JT65A signal. The other submodes are
> narrower still: a JT9-30 signal occupies about 0.4 Hz total bandwidth.
>
> JT9 is implemented in an experimental version of WSJT called WSJT-X.
> Some further details can be found at
>  http://www.physics.princeton.edu/pulsar/K1JT/WSJT-X_Quick_Start_Guide.pdf,
>  and an early version of WSJT-X can be downloaded from
>  http://physics.princeton.edu/pulsar/K1JT/WSJTX_01r2695.exe .
>
> If you want to try JT9, I suggest using dial frequency 1838, which is
> also used for JT65A, PSK31, and MFSK. In default configuration WSJT-X
> allows transmission and reception 1 to 2 kHz above the dial frequency.
>
> Please note: WSJT-X is in an early development stage. Your feedback
> (direct email to me is best) will be much appreciated. And feel free
> to email me for a sked!
>
> -- 73, Joe, K1JT
>
>
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